package com.qf.controller;

import com.qf.pojo.Cart;
import com.qf.pojo.User;
import com.qf.service.CartService;
import com.qf.service.CartServiceImpl;

import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.List;

/**
 * 购物车管理
 * @author fy
 * @version V1.0
 * @Project day41
 * @Package com.qf.controller
 * @Description:
 * @Date 2022/5/25 10:09
 */
@WebServlet("/cart")
public class CartController extends BaseServlet{

    /**
     * 创建购物车
     * @return
     */
    public String create(HttpServletRequest request, HttpServletResponse response){
        //1:获取商品id(页面处传来的参数使用getParameter)
        String pid = request.getParameter("pid");
        //2：获取session会话中当前用户的用户id
        User user = (User) request.getSession().getAttribute("loginUser");//UserController用户登录成功时放入session中
        //携带的用户user名称是loginUser
       if (user == null){
           //如果获取不到用户对象，说明用户没有登录，跳转到登录页面
            return "redirect:/login.jsp";
       }


        //3：调用service业务层，将购物车存入到数据库中
        CartService cartService = new CartServiceImpl();
        boolean cart = cartService.createCart(user.getId(), Integer.parseInt(pid));


        //4:跳转到购物车查询列表方法
        return "redirect:/cart?method=show";
    }


    /**
     *
     * 查询指定用户的购物车数据，并跳转到购物车列表页面展示
     * @return
     */
    public String show(HttpServletRequest request, HttpServletResponse response){

        //1:获取session会话中当前用户的id
        User user = (User) request.getSession().getAttribute("loginUser");
        if (user == null){
            //用户未登录，重新登录
            return "redirect:/login.jsp";
        }
        //2:根据用户id调用service查询这个用户的购物车
        CartService cartService = new CartServiceImpl();
        List<Cart> cartList = cartService.findCartListByUid(user.getId());
        //3:将用户购物车的数据放入request域中，带到页面进行展示
        request.setAttribute("list", cartList);
        //4：跳转到购物车列表页面展示
        return "forward:/cart.jsp";
    }

    /**
     * 修改购物车中购物项的购买数量
     * @param request
     * @param response
     * @return
     */
    public String update(HttpServletRequest request,HttpServletResponse response){
        //1：从会话中获取当前用户的id，如果获取不到跳转到登陆页面
        User user = (User) request.getSession().getAttribute("loginUser");
        if (user == null){
            return "redirect:/login.jsp";
        }
        //2:获取购物项主键id参数
        String cid = request.getParameter("cid");
        //获取购买数量
        String cnum = request.getParameter("cnum");

        //3:调用service，执行业务
        CartService cartService = new CartServiceImpl();
        cartService.updateCart(Integer.parseInt(cid), Integer.parseInt(cnum));

        //4:跳转到购物车列表方法，查看购物车中最新的数据展示
        return "redirect:/cart?method=show";
    }

    /**
     * 根据购物项主键id删除
     * @return
     */
    public String delete(HttpServletRequest request,HttpServletResponse response){
        //1:到session会话中获取当前登录对象，获取不到说明没登录，重新登录

        User user = (User) request.getSession().getAttribute("loginUser");
        if (user == null){
            return "redirect:/login.jsp";
        }
        //2:获取购物项主键id
        String cid = request.getParameter("cid");

        //3:
        CartService cartService = new CartServiceImpl();
        cartService.deleteById(Integer.parseInt(cid));

        //4:跳转到购物车列表方法，查看购物车中最新的数据展示
        return "redirect:/cart?method=show";
    }
}
